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import { CodedError, Platform, UnavailabilityError } from 'expo-modules-core';
import ExpoFontLoader from './ExpoFontLoader';
import { FontDisplay } from './Font.types';
import { getAssetForSource, loadSingleFontAsync, fontFamilyNeedsScoping, getNativeFontName, } from './FontLoader';
import { loaded, loadPromises } from './memory';
import { registerStaticFont } from './server';
// @needsAudit
// note(brentvatne): at some point we may want to warn if this is called outside of a managed app.
/**
* Used to transform font family names to the scoped name. This does not need to
* be called in standalone or bare apps but it will return unscoped font family
* names if it is called in those contexts.
*
* @param fontFamily Name of font to process.
* @returns Returns a name processed for use with the [current workflow](https://docs.expo.dev/archive/managed-vs-bare/).
*/
export function processFontFamily(fontFamily) {
if (!fontFamily || !fontFamilyNeedsScoping(fontFamily)) {
return fontFamily;
}
if (!isLoaded(fontFamily)) {
if (__DEV__) {
if (isLoading(fontFamily)) {
console.warn(`You started loading the font "${fontFamily}", but used it before it finished loading. You need to wait for Font.loadAsync to complete before using the font.`);
}
else {
console.warn(`fontFamily "${fontFamily}" is not a system font and has not been loaded through expo-font.`);
}
}
}
return `ExpoFont-${getNativeFontName(fontFamily)}`;
}
// @needsAudit
/**
* Synchronously detect if the font for `fontFamily` has finished loading.
*
* @param fontFamily The name used to load the `FontResource`.
* @return Returns `true` if the font has fully loaded.
*/
export function isLoaded(fontFamily) {
if (Platform.OS === 'web') {
return fontFamily in loaded || !!ExpoFontLoader.isLoaded(fontFamily);
}
return fontFamily in loaded || ExpoFontLoader.customNativeFonts?.includes(fontFamily);
}
// @needsAudit
/**
* Synchronously detect if the font for `fontFamily` is still being loaded.
*
* @param fontFamily The name used to load the `FontResource`.
* @returns Returns `true` if the font is still loading.
*/
export function isLoading(fontFamily) {
return fontFamily in loadPromises;
}
// @needsAudit
/**
* Highly efficient method for loading fonts from static or remote resources which can then be used
* with the platform's native text elements. In the browser this generates a `@font-face` block in
* a shared style sheet for fonts. No CSS is needed to use this method.
*
* @param fontFamilyOrFontMap string or map of values that can be used as the [`fontFamily`](https://reactnative.dev/docs/text#style)
* style prop with React Native Text elements.
* @param source the font asset that should be loaded into the `fontFamily` namespace.
*
* @return Returns a promise that fulfils when the font has loaded. Often you may want to wrap the
* method in a `try/catch/finally` to ensure the app continues if the font fails to load.
*/
export function loadAsync(fontFamilyOrFontMap, source) {
// NOTE(EvanBacon): Static render pass on web must be synchronous to collect all fonts.
// Because of this, `loadAsync` doesn't use the `async` keyword and deviates from the
// standard Expo SDK style guide.
const isServer = Platform.OS === 'web' && typeof window === 'undefined';
if (typeof fontFamilyOrFontMap === 'object') {
if (source) {
return Promise.reject(new CodedError(`ERR_FONT_API`, `No fontFamily can be used for the provided source: ${source}. The second argument of \`loadAsync()\` can only be used with a \`string\` value as the first argument.`));
}
const fontMap = fontFamilyOrFontMap;
const names = Object.keys(fontMap);
if (isServer) {
names.map((name) => registerStaticFont(name, fontMap[name]));
return Promise.resolve();
}
return Promise.all(names.map((name) => loadFontInNamespaceAsync(name, fontMap[name]))).then(() => { });
}
if (isServer) {
registerStaticFont(fontFamilyOrFontMap, source);
return Promise.resolve();
}
return loadFontInNamespaceAsync(fontFamilyOrFontMap, source);
}
async function loadFontInNamespaceAsync(fontFamily, source) {
if (!source) {
throw new CodedError(`ERR_FONT_SOURCE`, `Cannot load null or undefined font source: { "${fontFamily}": ${source} }. Expected asset of type \`FontSource\` for fontFamily of name: "${fontFamily}"`);
}
if (loaded[fontFamily]) {
return;
}
if (loadPromises.hasOwnProperty(fontFamily)) {
return loadPromises[fontFamily];
}
// Important: we want all callers that concurrently try to load the same font to await the same
// promise. If we're here, we haven't created the promise yet. To ensure we create only one
// promise in the program, we need to create the promise synchronously without yielding the event
// loop from this point.
const asset = getAssetForSource(source);
loadPromises[fontFamily] = (async () => {
try {
await loadSingleFontAsync(fontFamily, asset);
loaded[fontFamily] = true;
}
finally {
delete loadPromises[fontFamily];
}
})();
await loadPromises[fontFamily];
}
// @needsAudit
/**
* Unloads all the custom fonts. This is used for testing.
*/
export async function unloadAllAsync() {
if (!ExpoFontLoader.unloadAllAsync) {
throw new UnavailabilityError('expo-font', 'unloadAllAsync');
}
if (Object.keys(loadPromises).length) {
throw new CodedError(`ERR_UNLOAD`, `Cannot unload fonts while they're still loading: ${Object.keys(loadPromises).join(', ')}`);
}
for (const fontFamily of Object.keys(loaded)) {
delete loaded[fontFamily];
}
await ExpoFontLoader.unloadAllAsync();
}
// @needsAudit
/**
* Unload custom fonts matching the `fontFamily`s and display values provided.
* Because fonts are automatically unloaded on every platform this is mostly used for testing.
*
* @param fontFamilyOrFontMap The name or names of the custom fonts that will be unloaded.
* @param options When `fontFamilyOrFontMap` is a string, this should be the font source used to load
* the custom font originally.
*/
export async function unloadAsync(fontFamilyOrFontMap, options) {
if (!ExpoFontLoader.unloadAsync) {
throw new UnavailabilityError('expo-font', 'unloadAsync');
}
if (typeof fontFamilyOrFontMap === 'object') {
if (options) {
throw new CodedError(`ERR_FONT_API`, `No fontFamily can be used for the provided options: ${options}. The second argument of \`unloadAsync()\` can only be used with a \`string\` value as the first argument.`);
}
const fontMap = fontFamilyOrFontMap;
const names = Object.keys(fontMap);
await Promise.all(names.map((name) => unloadFontInNamespaceAsync(name, fontMap[name])));
return;
}
return await unloadFontInNamespaceAsync(fontFamilyOrFontMap, options);
}
async function unloadFontInNamespaceAsync(fontFamily, options) {
if (!loaded[fontFamily]) {
return;
}
else {
delete loaded[fontFamily];
}
// Important: we want all callers that concurrently try to load the same font to await the same
// promise. If we're here, we haven't created the promise yet. To ensure we create only one
// promise in the program, we need to create the promise synchronously without yielding the event
// loop from this point.
const nativeFontName = getNativeFontName(fontFamily);
if (!nativeFontName) {
throw new CodedError(`ERR_FONT_FAMILY`, `Cannot unload an empty name`);
}
await ExpoFontLoader.unloadAsync(nativeFontName, options);
}
export { FontDisplay };
//# sourceMappingURL=Font.js.map
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